• Ramesh Babu Nallamothu
• IN Niranjan Kumar
• BV Appa Rao
• Ananatha Kamal N
• Seshu Kishan N

In commercial sectors diesel engines are used mostly to power the vehicles like busses and trucks due to their higher thermal efficiency and better fuel economy. The countries world over imposed stringent emission regulations to counter the harmful effects caused by the emissions from diesel engines. Due to heterogeneous combustion process, diesel engines generally emit higher NOx and smoke which are very much damaging the environment. HC and CO emissions are less from diesel engine because mostly it works on lean mixtures. At present lot of research work is diverted towards finding eco friendly and renewable alternative fuels to petro diesel and reducing the harmful emissions from diesel engines to comply with the regulations imposed upon. Biodiesel produced from non-edible feed stock is found to be a good alternative to petro diesel. It is observed that the formation of NOx is very much dependent on the peak temperature in the combustion chamber. Various types of techniques are being tried by the researchers to reduce high NOx emission from usage of biodiesel blended fuel in diesel engines. The techniques used are like dilution using EGR, injection of water, retardation of injection timing etc. With the development of CRDI systems split and multiple injection strategy attracting the attention of researchers as a promising technique in reducing the NOx emissions. In this work an attempt is made to study the effect of various multiple injection strategies with different injection timings and dwell periods. In this multiple injection strategy of three injection pulses the pilot fuel quantity is fixed as 10% of total fuel injected, post injection fuel quantity is fixed as 0.5 mg. The dwell between pilot and main was varied at different main injection timing. The post injection is closely coupled with main injection with a dwell of 3 CAD. The main injection timing along with pilot and post was retarded from the recommended 23o bTDC in steps of 3 degrees. At all main injection timing the dwell of 10 CAD observed to be the best for smoke reduction, where as 20 CAD is better for NOx reduction. HC and CO emission observed to be reducing with multiple injection strategies.

Pilot injection, post injection, Biodiesel, blends, transesterification, Emission

"Emission Analysis of CRDI Diesel Engine fueled with cotton seed oil biodiesel with multiple injection strategy", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 9, page no.707-712, September-2018, Available :http://www.jetir.org/papers/JETIR1809136.pdf

"Emission Analysis of CRDI Diesel Engine fueled with cotton seed oil biodiesel with multiple injection strategy", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 9, page no. pp707-712, September-2018, Available at : http://www.jetir.org/papers/JETIR1809136.pdf